Mechanical dop for polishing (cutting) diamonds.



E. SOETENS.

MECHANICAL D\P FOB. POLISHING (CUTTING) DIAMONDS. APPLICATION FILED JUNE12, 1913.

1 1 Patented Jul 14, 191% Fig.1.

rrsn STATES PATENT orrion.

EDGARD SOETENS,

or BORGIERHOUT-IANTWERP, BELGIUM.

MECHANICAL D01" FOR POLISHING (CUTTING) DIAMONDS.

mosses.

I cal Dop for Polishing (Cutting) Diamonds,

of which the following is a specification.

My invention relates to a mechanical dop for cutting diamonds. 4

The object of the said invention isto cut the facets with the greatestpossible precision and also to divide the facets, to obtain with greatfacility the angle of their position and slope by means of indicationsupon the dop itself.

I illustrate my drawing, viz:

Figure 1 is a plan View of the tongs and the dop. Fig. 2 is a side viewof the tongs the mechanical dop in position for cutting the table orcollet. Fig. 3 is a rear end view of the tongs. Fig. 4 is a crosssection of the dop mounted on a swivel. Fig. 5 is a cross section of thedop mounted on hinges instead of on a swivel as in Fig. aface view ofthe dop. Fig. view of the dop.

The mechanical dop with holder as shown in the drawing is applied to theordinary mills. The dop consists of a main body in the hollow of whichis placed a rotary cylinder (2). This cylinder carries the small dop (3)in which the stone to be cut is device by the annexed 7 is a backplaced. The extreme point of the small dop (3) which is in the cylinderis carried so as to be firmly fixed, at. the same time this small dopmay be turned in the cylinder at will by means of a key or pincers ifnecessary.

To hold the stone in thesmall dop (3) two hooks or pineers are used; a'forked hook (l) and a fixing hook These two hooks are placed one behindthe other. The forked hook (4:) holds the stone on two of its slopingsides (above the edge) while it is being cut. The fixing hook pressesthe table or collet and holds the stone .rigid while the cylinder turns.The forked hook and fixing hook are fixed respectively by the screws (6)and (7). Cylinder (2) bears upon its visible part diflerent divisionswhich are'regulated by a-small dent made in the extremity of the mainpart of the cylinder.

The divisions upon the cylinder made by by a screw (17) l. Fig. 6 isSpecification of Letters Patent. Patented July 14, 1914, Applicationfiled June 12,1913. Serial No. 773,340. 1

vertical lines correspond with the several face-ts to be cut on thestones, viz-Eight long lines equidistant from each other and by whichthe eight corners are cut. Eight shorter lines placed in the middle ofthe preceding eight lines and by which the star facets are cut. Sixteenstill smaller lines in the middle of the immediately preceding lines bywhich the half facets are cut.

Screws (8) serve to fix the cylinder. The dop is attached to the of aswivel Fig. 4, or ried by a small tube made to fit an opening in theholder (12). The end of the holder is fashioned so the small tube may befixed in the tongs or twee'zer. At the wide, rear extremity of thetongs, Fig. 1, are placed two levels (13) and two screws (19) by meansof which'the tong may be set.

on the mill.

perfectly horizontally horizontally fixed, the

When the holder is small tube falls perpendicularly upon the mill, asthe latter is also level.

When the surface of the stone, upon which a certain facet is to be cuttouches the disk at the exact spot with the proper angle of inclineobtained by the movable joints (10) or (11) the dop may be turned toright or to left in orderto find the grain of the stone without changingthe angle of the incline of the facet. Thus no matter how the dop isturned in'the tongs, the same facet always touches the mill with thesame angle of incline.

To turn the dop in the holder one has only to unscrew the screw (17). Toregulate the size of the facet the holder is provided with a regulatingscrew (15'). For instance, when the first corner has reached the desiredsize, screw (15) is turned until it comes against the bridge (14) on alevel with the mill. Screw (15) may then be prevented from turning byacounter-bolt, when screw (15) by the cutting of the following cornerscomes against the bridge, the dop can fall no farther and the othercorners can be no larger than the first. The same follows for the starfacets and half-facets.

What I claim and desire to secure by Letters Patent of the United Statesis: i

An adjustable dop comprisinga cylindrical carrier, :1 support thereforin which said carrier is rotatable about its axis of symmetry, tongs,and adjusting member carried by said tongs, a ball and socket jointbetween said support and said member, the ball of said joint forming apart of said support, and having in the apex thereof a, guiding slit inthe main plane of oscillation thereof a set screw carried by saidmember, the

pointed end of which cooperates with said slit to guide the movement ofsaid support Witnesses: v

J. J 0s. ROsENsHAMEL, G. DEIIERSY,

